Furnace



J. A. STAIRS April 2s, 1925.

FURNACE 2 Sheets-Sheet 2 Filed March l, 1924 INVENTOR Patented Apr. 28, 1925.

lillllITliID SJTATES 1,535,352 1PA Tsar oir-HCE.

JAMES Af STARS, 02E' PITTSBURGH, PENNSYLVANIA, ASSIGNOR TO THE CALORIZING 1GOMPANY,OF PITTSBURGH, PENNSYLVANIA, A GOR-.ORATION' OF DELAWARE.

FURNACE.

Application iledMareh 1, 1924.. Serial N0. 696,387.

T01 alt 'who/nt `t may conceive:

Be it `known that L-dAMns A. STAIRS, a

subject ofthe King of England, residing at' Pittsburgh, county o`f Allegheny, State of 5 Pennsylvania, United vStates of America,

El0 furnaces, and more particularly to -furnaces `ofthe open or forge type and to means for supporting the archorroof in cooperative relation thereto.

It has heretofore been customary in the art toi-which this invention relatesto construct a Ifurnace ofkthe` opentype and 4support the archor roof directly `thereon by piers'built up moreor less loosely. These arches themselves have usually been built of loose bricks'toenable them to be repaired with comparative ease. Such constructions are objectionable, however, from the fact that the size of the furnace is thereby too definitely fixed, and the substitution of other furnaces requires the tearing down of subi stantially the entire structure. Furthermore, the construction of the arch has not been such as to produce efficient heat radiation downwardly.

By the present invention thereis provided an arch of maximum efficiency adapted to be readily assembled in operative relation to furnaces of different sizes, together with means for recovering the heat from the waste gases from the furnace.

In the accompanying drawings I have shown, for purposes of illustration only, a preferred embodiment of the present invention, it being understood that these draw ings do not define the limits of my invention, as changes in the construction and operation therein disclosed may be made without departing from the spirit of the invention or scope of my broader claims.

ln the drawings Figure l is a front elevation of a furnace and frame in operative relationship, and

Figure 2 is a vertical transverse sectional view on the line IIII of Figure l, the recuperator being shown in elevation.

In carrying out the present invention there is preferably provided an open frame which may conveniently be composed of angle irons 2 forming the corner posts. Each of these corner posts preferably has a lower portion 3 adapted to `be'bolted to themain corner post indifferent p'ositionsto provide `meansfor adjustingtheheight ofthe frame. This frame preferably has 'both the ends and sides thereof open to, readily receive a furnace F of any desired type and construction. As the invention relates particularly to furnaces of the openor forge type, it `will be apparent that the frame does not `interfere with access to the furnace'as required.

Adjacent their upper portions,the corner posts'carry a roof `or arch et constructed of suitable heat refractory material. This arch is preferably curved, as clearly shown lin Figure 2, `whereby a maximum amount of heat is reflected downwardly and concentrated on the furnace. The roof is also provided with a series of openings 5 for the `passage of wastegases. These openings'are preferably formed in the arch adjacent each of the ends, thereby providing a central portion 6 having a substantially unbroken heat radiating surface and preventing direct passage of the major portion of the gases therethrough.

Above the arch l there is preferably provided a substantially enclosed chamber C having its roof formed by a second arch 7. This arch preferably has a central opening 8 located directly above the imperforate portion 6 of the lower arch and permittingthe passage of the waste gases to a recuperator 9. This recuperator may be of any desired construction having a' suitable inlet l() for the cold air and outlet l1 for the heated air. This outlet may supply hot air to the burners for the furnace F as well understood in the art.

When it is desired to utilize a smaller furnace, the burners are disconnected and the furnace bodily removed from between the corner posts and the new furnace placed in position. Any desired number of openings 5 are then closed whereby the perforat-e portion of the roof may be changed to correspond roughly to the size of the furnace substituted. This operation is made possible by reason of the provision of a substantially permanent roof structure supported entirely independently of the furnace.

Further advantages of the invention arise from the provision of an adjustable frame whereby the arch may be brought into such relationship as to most efficiently radiate the heat, and from the provision of a recuperator by means of which the heat of the Waste gases is saved.

I claim:

l. The combination with an open furnace, of a frame cooperating therewith and supported independently of the furnace, and a roof carried by said frame above the furnace, substantially as described.

2. The combination With an open furnace, of a. frame cooperating` therevf'ith and supported independently of the furnace, and a 4roof carried by said frame above the furnace, said roof having a series of openings for the passage of Waste gases, substantially as described.

3. The combination with an open furnace, of a frame cooperating therewith and supported independently of the furnace, a heat radiating roof supported by said frame above said furnace, said roof having a series of openings for the passage of waste gases, and means for recovering the heat from the Waste gases passing through said openings, substantially as described.

4. The combination with an open furnace, of an adjustable frame cooperating therewith and supported independently of the furnace, and a roof supported entirely by said frame for radiating heat downwardly on to the furnace hearth, substantially as described.

5. The combination With an open furnace, of a frame cooperating therewith and supported independently of the furnace, said frame having a heat radiating roof supported thereby, a chamber above said roof, said roof having a series of openings for the passage of Waste gases, and means cooperating with said chamber for recovering the heat of the Waste gases passing through said openings, substantially as described.

6. A frame for use With open furnaces, comprising adjustable corner posts, a perforated arch carried by said corner posts, a chamber above said arch, and means supported by said frame above said chamber for recoveringl the heat of Waste gases passing through saidA arch, substantially as described.

7. A frame for use With open furnaces, comprising corner posts, a perforated arch carried by said corner posts, a chamber above said arch, and means supported by said frame above said chamber for recovering the heat of' Waste gases passing through said arch, substantially as described.

In testimony whereof I have hereunto set my hand.

JAMES A. STAIRS. 

